This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: • Nitrogen (N) • Phosphorous (P) • Sulfur (S)-Table 3-6 & figure 3-29 Different elements cycle at different rates-Rate depends upon chemical reactivity • Higher the reactivity, the faster the cycling The Carbon Cycle-Carbon is withdrawn from the atmosphere by photosynthesis: • CO2 +H2O + energy = CH2O =O2-Carbon is returned to the atmosphere by combustion (burning fuel & by respiration) : • CH2O + O2 =CO2 +H2O +energy-Figure 3.25 & 3.27a Human Impact-Many biogeochemical cycles are being accelerated, causing both depletion of resources and pollution-Carbon is a major…. Phosphorous Cycle-Rate depends upon chemical reactivity • Higher the reactivity, the faster the cycling-Existence of a gas phase • No gas phase, very slow cycling e.g Phosphorous-Figure 3-30...
View Full Document
- Spring '09